Valve mechanism for internal-combustion engines



Feb. 17,1925. wzama- P. A. POPPE VALVE MECHANISM FOR INTERNAL CUMEUSTION ENGINES Filed March 29, 1923 INVENTUH ZY ZEKZLEL ZQ P R 19 MR/Mam ATTORNEY 'Be it known that I, PETER UNITED STATES PATENT OFFICE.

rerun AUGUST rorrn, or covnnrmr, ENGLAND.

'VALVE MECHANISM FOR INTERNAL-COMBUSTION ENGINES.

Application filed March 29, 1923. 'Serial No. 828,589.

To all whom it may concern AUcUs'r Form, a Norwegian subject, residing at Coventry, in the county of lVarwick, England, have invented certain new and useful Improvements in Valve Mechanism for Internal- Combustion Engines, of which the follow ing is a specification.

This invention relates to valve mechanism for internal combustion engines in which the inlet and the exhaust valves are of the overhead kind. Usually, to obtain symmetrical arrangement of the valves by inclining them on each side of the lon itudinal centre line of the engine, the cams aft is arranged centrally between them and operates the valves through rockers. lVith this arrangement, therefore, itis impossible to locate thesparking plugs between the two valves in the centre of the combustion both. sides of the latter; those upon the side he opposite to the camshaft by means of push rods extending between or at the sides of the cylinders, while those on the same side as .the camshaft are actuated either directly from it, or indirectly through push rods, accordin as the camshaft is located adjacent the cy lnder head or the crankcase.

In the accompanying drawin Figure 1 is a central vertlcal section through a cylinder showing one method of carrying out this invention. 7 Figure 2 is another section of the same on a plane parallel to that of Figure 1.

In the construction shown in Figures 1 and 2, there is arranged at each side of the cylinder A a compartment B and O. In one of the compartments B is mounted the camshaft D, and preferably also the usual pivot 1L upon which the rocker E is pivoted for direct engagement by the cam D The rod may be provided either with rocker E actuates the valve H in the usual manner.

The preferred arrangement of the rockers is such that the arm E on which the cam bears is substantially parallel to the cylinder axis, the other arms E and F bearing upon the valve stems-in the usual manner.

A push rod J extends transversely to the cylin er axis through the head and is guided on the cylinder head. The push rod is put in place previous to the mounting of the camshaft by providing an aperture B in the wall of the compartment B of suitable size for its entry, the aperture subsequently being closed by means of a plug. The push a pad or with a roller where it bears against 1ts cam D and its opposite end acts upon the arm F of the rocker F. As the push rod is in a lane to one side of that containing the va ve stems, the rocker F would necessarily have its arms ofi'set correspondingly, althou h in certain cases this might be reduce very considerably or wholly, by locating the two valves in a vertical lane which was suitably inclined to the ongitudinal axis of the engine to allow for the offset position of the push rods. It will be seen that the sparking plugs K can be located between the valves, as is desired.

With the foregoing construction it could arranged that a single cam actuated the exhaust valve upon one side of the engine, and the inlet valve upon the other, the rocker for the one and the push rod for the other bearing upon the one cam, but with this arrangement special modifications of the rockers would be necessary to ensure the correct timing of the valve in the known manner.

For lubrication purposes oil would be. conveyed to either or both of the compartments B and C, but preferably to the one B, and thence, by a conduit, to that C, returning to the crankcase by way of the guide 1 tube Z for the inclined push rod.

It will be seen that in this construction the invention provides a very simple form of valve actuating mechanism, which ensures ready access to they working parts, while at 1 the same time providing a clear space between the two valves for the sparking plug. Ample provision is made for lubrication of the working parts, thus ensuring their quiet action. 1

What I claim as my invention and desire to secure by Letters Patent of the United States is:- g

In an internal combustion engine, the combination of a cylinder head, a conical combustion chamber therein, an inlet valve seating u on one sloping side of said combustion c amber, an exhaust valve seating upon the other sloping side of said c0mbus tion chamber, an ignition device located in the apex of said combustion chamber between said valves, a camshaft carried by said cylinder head within a compartment arranged on one side thereof and extending transversely of the cylinder axis,' a rocker mounted in said compartment on one side of said cylinder head directly engaging one of said valves and said cam shaft, a second rocker mounted in another compartment on the opposite side of said cylinder head engaging the other of said valves, a horizontal ush rod within said cylinder head enga mg sald sec-0nd rocker and said cam shatt, a bearing within said cylinder head for said push rod adapted to support itat both ends and to form an oil duct connecting said compartments, and a cover for each of said compartments which encloses the rocker there in and also the end of said valves operated by it, the Whole forming with the cylinder head aunit construction of valves and valve operating mechanism, substantially as set forth.

In testimony whereof I have signed my name to this specification ii the presence of two subscribing witnesses.

PETER AUGUST POPPE.

Witnesses:

JOHN ARKLE, EVA COLLIER. 

